Chisel for forming mortises for drawer-locks



(No Model.)

B. HAMBUJER.

CHISEL FOR FORMING MORTISES FOR DRAWER LOCKS.

No. 415,636. Patented Nov. 19, 1889.

"UNITED STATES PATENT OFFICE.

EPHRAIM HAMBUJER, OF DETROIT,'MIOHIGAN.

CHISEL FOR FORMING MOR TISES FOR DRAWER-LOCKS.

SPECIFICATION forming part of Letters Patent No. 415,636, dated November 19, 1889.

ApplicatiOn filed May 4, 1889. Serial No. 309,549. No model.)

To aZZ whom it may concern:

Be it known that I, EPHRAIM HAMBUJER, a citizen of the United States, residing at Detroit, in the county of \Vayne and State of Michigan, have invented certain new and useful Improvements in Chisels for Forming hllortises for Drawer-Locks, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to new and useful improvements in chisels for forming mortises for drawer-locks; and the invention consists in the peculiar construction and arrangement of the parts, whereby the peculiar mortise used for securing drawer-locks can be made at one operation of the chisel, all as more fully hereinafter described, and shown in the accompanying drawings, in which- Figure 1 is a perspective view showing the chisel arranged as for operation. Fig. 2 is a cross-section of Fig. 1. Fig. 3 is a perspective View of the preferable form of constructing the chisel. Fig. 4 is a vertical central cross-section of Fig. 3, and Fig. 5 is a detached perspective view of the body of the chisel.

A is the tapering body of the chisel, provided with the shank B for securing it to the chisel-bar.

C is a straight cutting-edge at the tapering lower end of the body of the chisel.

D are cuttingdips at right angles to the cuttingedge O.

E is a tapering tongue projecting below the cutting-edge C in the center thereof. F is a cutting-edge formed at the lower end of this tongue.

G are two short side chisels at the upper end of the chisel-bodyA on opposite sides, and H and I are straight cutting-edges formed on the lower end of the side chisels, the outer one projecting below the inner one. All the cutting-edges of the chisel are preferably arranged in the same plane with the face of the chisel-body, and in practice are intended to cut the drawer-lock mortise shown in Figs. 1 and 2, the shape of which in cross-section corresponds with the shape of one half of the chisel at either side of its center. Thus one half of the mortise may be cut by feeding the board in which the mortise is to be cut in one direction, beginning from the center of the mortise, and then by feeding in the opposite direction after reversing the chisel.

The board to be cut is placed upon the usual supporting-guide K, which is cutout at L for the chisel to work through into the wood, all as in the ordinary construction of mortising-machines in use for this kind of work.

The whole chisel, as described and shown in Figs. 1 and 2, may be formed integrally in one piece; but Ipreferably construct it in the more practical form shown in Figs. 3, 4, and 5,in which the tongue E is formed of a chiselbar secured in an inclined recess a, formed in the body of the chisel, and a cap 1), adapted to fit a corresponding recess formed in the body of the chisel, holds the said bar adj ustably and removably in position by means of suitable screws 0, which, when screwed in, cause the cap to bear against the bar.

The side chisels G, I preferably construct of separate chisel-bars of angle-bar steel, which are adjustably and removably secured to the body of the chisel by means of the grooved caps 01, which fit on the outside of these chisel-bars and are secured to the body of the chisel by a transverse bolt 6, which has a nut f for tightening, all so arranged that by tightening the nut sufficient pressure is exerted by the caps d to clamp the chiselbars firmly to the body of the chisel. By means of this construction the cutting-edges may be easily ground and accurately adj usted in relation to each other, as it will be seen that every cutting-edge of the chisel is in independent adjustable relation to the main cutting-edge G, and therefore if any one cutting edge needs regrinding the other need not be ground, as would be the case if the chisel were made in one integral piece. A practical form of chisel, however, is obtained by making the side chisel only adjustable in the manner described and making the cutting-edges at the lower end of the chisel integral with the body.

hat I claim as my invention is-- 1. The herein-described reversible chisel for forming mortises for drawer-locks, the same consisting of the body A, having the cutting-edges O O and cutting-lips D, the central tongue E, having the projecting cuttingedge F, and the side chisel G, having the cutting-edges H and I, all arranged to operate substantially as described.

2. The herein-described reversible chisel for forming inortises for drawer-locks, the same consisting of the body A, provided with the cutting-edges C G and F and cutting-lips D in combination With the detachable and adjustable side chisels G, formed of anglebar steel, With the cutting-edges H and I, the grooved cap (Z, and the bolt 0, having the clamping-nut f, substantially as and for the purpose described.

3. The herein-described reversible chisel for forming niortises for drawer-locks, the same consisting of the body A, having the cutting-edges O C and cutting lips D, the central tongue E, formed by a separate chiselbar adj ustably and removably secured by the cap I) in a recess a of the body of the chisel and provided with a projecting cutting-edge F, and the side chisels G, formed of separate chisel-bars independently, adjustably, and

relnovably secured by the caps d and bolt 6 and having the cutting-edges H and I, all arranged and constructed to operate substantially as and for the purpose described.

In testimony whereof I affix my signature, in presence of two witnesses, this 2d day of May, 1889.

.EPHRAIM I-IAMBUJER.

itnesses:

ED. MCBREARTY, A. B. EATON. 

